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-9-[-10-10]
-9-(-20)
-9+20
11
+ por + = +
- por - = +
+ por - = -
- por + = -
SOLUCION:
- 9 - [- 10 + (15 - 25)]
- 9 - [- 10 + (- 10)]
- 9 - [- 10 - 10]
- 9 - [- 20]
- 9 + 20
11 ----->>> Respuesta <<<